I'd like to see the second expansion concentrate on ground units. For starters I want to see actual Arty aswell as Flak Guns in action. Arty batteries sometimes semi hidden would go hand in hand with the new observer mechanics.

Still can't wait for expansion No1 and the new flyables!

I agree. The recon wars add-on was such an awesome start. I almost never used to play that part of the war, but it is much better with something to do. Improving that an making a valid and fun full war recce career would be quite a thing!